Gear-reduction draw works



Apr-ii 14, 1931. w. D. DAVIDSON 1,300,513

GEAR REDUCTION DRAW WORKS v Filed Aug. 28, 1923 4 Sheets-Sheet l INVENTOR.

(Uz'llz'am D. Davidson,

A TTORNEYS w. D. DAVIDSON 1,'800;513

GEAR REDUCTION DRAW WORKS April 14, 1931.

Filed Aug. 28, 1923 4 Sheets-Sheet 2 A 5a T ga H9 52 57 U .12 I 0 17 362 68 32 35 .26 .29. 33 Q 6 7 73 7 g '22 T a WF M A TTORNEYS April 14,1931- -w. D. DAVIDSON 1,800,513

GEAR REDUCTION DRAW WORKS 4 Sheets-Sheet 5 INVENTOR [12am Z fiaz/z'dson,iw rfia ATTORNEYS ZI/Z.

Filed Aug. 28 I 1923 A ril 14, 1931. w. D. DAVIDSON 1,800,513

GEAR REDUCTION DRAW WORKS Filed Aug. 28, 1923 4 Sheets-Sheet 4 ATTORNEYSPatented A r. 14, 1931 UNITED STATES PATENT OFFICE WILLIAM D. DAVIDSON,

comrm, or 'ronnancn, oamroanm,

A CORPORATION OF CALTFORIN'IA GEAR-REDUCTION DRAW WORKS Applicationfiled August 28, 1928. Serial No. 659,734.

section, from the line indicated by 6-6, Fig- 1 This invention relatesto draw works having two separate gear sets for obtaining two differentspeeds of the drum of said draw works.

An object of this invention is to provide a draw works that willeliminate use of the usual line shaft, chains, sprockets and jawclutches employed in driving a drum at lower and higher speeds. The drumshaft of. the invention is provided with a sprocket wheel driven directby the engine, and saiddrum shaft drives the drum through either one oftwo sets of reduction gears, one set at either end of the drum. Thereduction gearing is of the planetary type, the gear cases freelyrotating when not held against rotation by brake bands. When the brakebands are applied the gear cases remain stationary and the power is thentransmitted through pinions carried by the gear cases to the drum shaft.

Another object of the invention 15 to make provision for permitting butone of the brake band operating pedals to be operated at one time. Wheneither pedal is depressed the remaining pedal is locked and cannot Tmoved.

The accompanying invention:

Figure 1 is a front elevation, partly in secdrawings illustrate thetion, of a gear reduction draw works constructed in accordance with theprovisions of this invention, the clutches for connecting the enginedriven sprocket with the rotary drive sprocket and the shown in neutralpositions, the brake band-operating lever away.

Fig. 2 is an end elevation of Figure 1 from and a portion being brokenthe left thereof. 3

Fig. 3 is a fragmental plan view of Figure 1, a portion of thebrake-equalizing bar being broken away.

Fig. 4 is an enlarged elevation from the line indicated by 44, Figure 3.

Fig. 5 is an enlarged elevation, partly in section,-fro m the lineindicated by 5-5, Figure 3. Fig. 6 is an enlarged elevation, partly inbeby drum shaft being f shaft 24 and collar 26 are provided w1th armsure 3.

Fig. 7 is an enlarged elevation, part1 in section, from the lineindicated by 7-7, ig-

ure 3. v

Fig. 8 is an enlarged sectional elevation from the line indicated by8-8, Figure 1.

Fig. 9 is an enlarged sectional elevation from the line indicated by9-9, Figure 1.

Referring to the drawings, there is provided a drum shaft 11 journaledin bearings 12 which are mounted on a suitable supporting frame 13.Rotatably mounted on the shaft 11 is a drum 14. The drum 14 is-providedat its opposite ends with brake drums I,

or LOS ANGELES, camronma, Assrenon 'I'O UNION roof. I

brake bands 16 is pivotally connected at 19 to an arm 20 which is keyedat 21 to a rock shaft 22 mounted in bearings 23 supported the frame 13.Journaled on the shaft 22 is a tubular shaft 24 which is pivotally"connected at 25 to the other end of the other brake band 16. Thetubular shaft 24 is interposed between one of the bearings 23 and acollar 26 fixed to the shaft 22, thus preventing the shafts 22, 24. Thearm 20 is interposed between the other bearings 23, thus preventingendwise motion of the shaft 22. The

27 which are pivoted at 28 to. U-links 29, that in turn, engage otherU-links 30. The \Jdinks 30 are pivoted at 31 to a pressure equalizingbar 32 which in turn is pivotally connected at 33 to a link 34. Theequalizing bar 32 is broken away at one end in Figure 3 in order topermit full illustration of the structure of the draw works, but itsleft end is connected to the left arm 27 of the collar 26 in the samemanner as its right by the U-link 30 to the arm 27 secured to thetubular shaft 22. The'link 34 is pivoted at 35 to a hand lever 36. Itwill be clear that the hand lever'36 can be'operated to apply relativeendwise movement between tailed description herein.

the brake bands 16 to the brake drums 15 to slow up and stop the drum14.

Rotatably mounted on the shaft 11 is a sprocket wheel.37 adapted to bedriven by a prime mover, not shown. Preferably the sprocket wheel 37rotates upon a bronze bushing 38 instead of directly on the shaft 11.This sprocket wheel 37 transmits power from the prime mover to the shaft11 through a clutch, one of the clutch members being indicated at 39 onthe hub of the sprocket wheel 37, and the cooperating clutch member at40. The clutch member 40 is splined to the shaft 11 at 41. The clutchmember 40 is operated by the usual shifting fork 42 which is pivoted at43 to a connecting rod 44 that in turn is pivoted at 45 to one end of afoot operated lever 46 fulcrumed at 47 on the frame 13. The lever 42 isfulcrumed at 421 on the frame 13 and is normally held by a spring 422 inposition to disengage the clutch 39, 40.

Also rotatably mounted on the bushing 38 is a sprocket wheel 48 whichmay be connected by a sprocket chain, not shown, to a rotary machine,not shown, of the type" employed in drilling wells by the rotary method.That is to say, the rotary machine is driven through the agency of thesprocket wheel 48 that is driven by the sprocket wheel 37 through aclutch, one member 49 of which is on the hub of the sprocket 48 and theother member 50 of which is s linedto the elongated hub 51 of the sprocet wheel The clutch member 50 is operated by the usual shifting fork 52which is fulcrumed at 53 on the frame 13. The shifting fork 52 ispivoted at 54 to a connecting rod 55 which is pivoted at 56 to anoperating lever'57 that is fulcrumed at 58 on the frame 13. The lever 57will be adjustably held in different positions by the usual quadrant andratchet device indicated in general by the character 59, such devicesbeing well understood in the art relating thereto and, therefore, notrequiring de- The lever 57 is normally held by a spring 571 in positionto disengage the clutch 49, 50. It will be clear that, to operate therotary machine, the lever 57 will be moved to the left in Figure 1, thusoperatably connecting the sprocket wheel 48 to the engine drivensprocket wheel 37.

One of the gear sets will now be described. Keyed therefore to the drumshaft 11 is a spur gear wheel 60 which is in mesh with a spur pinion orpinions 61, there being two of such pinions, in this. instance, inpreference to one to obtain balance of the rotating mass.

The pinions 61 are keyed on the hubs of other spurpinions 62 which aremounted on shafts 63. The shafts 63 are carried by a gear case 64. Thepinions 62 are in mesh with a spur gear wheel 65 which is keyed to thedrum 14. It will be seen that, if the gear case 64 is not held againstrotation, turning of the gear wheel 60 by the shaft 11 will effectplanetary a rock shaft 71 that is mounted in bearings 72 carried by theframe 13. The other end of.

said brake band is provided with an eye for pivotal jconnection with thecrank arm 70.

Vhen the crank arm is turned clockwise" in Figure 6, the brake band willbe tightened. The crank arm 70 constitutes one arm of a "lever of whichthe other arm is indicated at 7 3. The lever arm 73 constitutes a footpedal for tightening of the brake band. The foot pedal 73 is normallyraised, in position to expand the brake band 67, by a coil spring 74.which'is connected at one end to the pedal 73 and at its opposite endto the frame 13.

The gear set just described is at the left end of the drum 14 in Figs. 1and 3 and is substantially duplicated at the opposite end of the drum 14and the duplicated elements thereof will be indicated b the samereference characters with the a dition of the letter indices a. In thissecond gear set, however, the crank arm 7 0a instead of bein rotatablymounted on the rock shaft 71 is keyed to said shaft, as indicated at 75in Figure 7.

In practical operation of the invention, as suming that the rime moveris rotating the sprocket wheel 37 if it be desired to operate the rotarymachine, not shown, the clutch 39, 40 will be disengaged and the clutch49, 50 engaged. If, however, it be desired to effect operation of thedraw works, the clutch 49, 50 will be disengaged and the clutch 39, 40engaged, thus rotating the shaft 11. Then the drum 14 will be operatedat one speed or another, according as the operator desires, bycontraction of the brake band 67 or the brake band 67a. The two trainsof gears provided at the opposed ends of the drum 14 provide differentratios of drive between the drumshaft ll and the drum 14. By variationof these dimensions of the gears in the respective trains, a multi lespeed drive is providedbetween the shaft 11 and the drum 14.

site directions from the shaft 76 and in the path of downward movementof the foot pedals 73, 7 3a, respectively. Thus, when the mounted shaft,a drum loose on said shaft,-

sprocket wheels loose on the shaft, clutch means between the sprocketwheels, clutch means between one of the sprocket wheels and the shaft,and means operated by rotation of the shaft to rotate the drum.

2. A draw works comprising a shaft, a drum operatably connected withsaid shaft, a sprocket wheel loose on the shaft adapted 'for connectionwith a rotary drilling machine, a second sprocket loose on the shaftspaced from the first mentioned sprocket and adapted for connection witha prime mover, a clutch member on one of the sprockets, a clutch memberadapted to cooperate with the first mentioned clutch member and splinedon the hub of the other sprocket, means to move the second mentionedclutch member to and from engagement with the first mentioned clutchmember, a third clutch member on one-of the sprockets, a fourth clutchmember splined to the shaft, and means to move the fourth clutch memberto and from engagement with the third clutch member.

3. In a rotary draw works, the combination of a frame, a shaft journaledin bearings secured to the frame, a drive sprocket journaled on the saidshaft, clutch means for disengageably securing the said sprocket to theshaft, a rotary drive sprocket journaled on the said shaft, clutch meansfor releasably establishing a driving connection between the first saidsprocket and the rotary drive sprocket, a drum mounted on the shaft, andspeed reducing gears between the said drum and shaft for drivm the saiddrum from the said shaft when t e said rotary drive sprocket isdisengaged from the said shaft, and the drive sprocket is engagedtherewit ,4. In a rotary draw works, the combination of a framecomprising spaced apart vertically extending posts, a shaft journaled inbearings transversely of the said posts, a drive sprocket journaled onthe said shaft, clutch means for disengageably securing the saidsprocket to the shaft, a rotary drive sprocket journaled on the saidshaft, clutch means for releasablyestablishing a driving connectionbetween the first said sprocket and the rotary drive sprocket, the saiddrive sprocket and rotary drive sprocket and the said clutch means beingmounted on the said shaft intermediate a pair of the posts on the saidframe,

a drum journaled on the said shaft between a second pair of posts on thesaid frame, and speed reduction gears between the said drum and shaftfor driving the said drum from the said shaft when the said rotary drivesprocket i disengaged from the said shaft.

5. In a rotary draw works, the combination of a frame, a shaft journaledin bearings secured to the said frame, a drive sprocket journaled on thesaid shaft and adapted to be connected with a prime mover, clutch meansfor disengageably securing the said sprocket to the said shaft, a rotarydrive sprocket journaled on the said shaft, clutch means releasablyestablishing a driving connection between the first said sprocket andthe rotary drive sprocket, independent actuating means for the clutchmeans pivotally supported by the said frame and extending to a point ofaccessibility at the same end of the said frame. a drum mounted on thesaid shaft, and speed reduction gears between the said drum and the saidshaft for driving the said drum from the said shaft when the said rotarydrive sprocket clutch means is actuated to disengage the said rotarydrive sprocket from the said shaft, and the drive sprocket is engagedtherewith.

6. A draw works comprising a pair of spaced posts, a shaft journaled inhearings on the posts, a hoisting drum journaled on the shaft, means fordriving the shaft, a rotary drive sprocket mounted on the shaft, clutchmeans for releasably establishing a driving connection between the meansfor driving the shaft and the rotary drive sprocket, and a multiplespeed drive means between the shaft and drum.

Signed at Torrance, Calif, this 20th day of August, 1923.

WILLIAM D. DAVIDSON.

